It'snotusefulforyouifyoucan'trememberwhatyoureadorstudy．Youjustwasteyourtime．Ifyouwanttorememberwhatyoustudyorreadwell，youmusthaveaspecialpurposeorreasonforreading．Whenyouknowwhyyou'rereading，youcan
It's not useful for you if you can't remember what you read or study．You just waste your time．
If you want to remember what you study or read well，you must have a special purpose or reason for reading．When you know why you're reading，you can remember better．
Think why a salesgirl in a store goes away when your answer to her offer is"No，thank you．I'm just looking around"，because both you and she know that you aren't sure what you want．But if you say，"Yes，thank you．I want a pair of sun glasses．"instead，She will say："Right this way，please．"And she will be very glad to lead you to what you want．
It's quite the same with your studying or reading．If you choose a book，you only think，"just look"but without any purpose，you are likely to get nothing．But if you know what you want，you are almost sure to get something from it when you read or study．You want"to find out more about"，"to understand the reason for"．A good reader has a clear purpose or reason for what he is doing．He canconnectthe information to hisgoal and remember it better．
Reading is not one single activity，either．At least two importantprocesses（过程） go on at thesame time．
As you read，you take in ideas quickly and correctly．But at the same time you express your own ideas to yourself when you read．You have a kind of mental conversation with the writer．If you express your ideas，they may sound like this："Yes，I agree．That's my opinion too．"or"Oh，I thought that record was broken much earlier．I'd better check those dates，"or"But there are some other facts to be considered!"You don't just sit there taking in ideas，you really do something else，and that something else is very important．
Another process of thinking about what you read includes judging it，connecting it to what you already know，and using it for your own goals．In other words，a good reader is a critical（批评的） reader．